I figured this might be the best subforum to get an authoritative answer on the topic, but what was the original factory finish on the metal parts of the Parris-Dunn USN Mk 1 Dummy Training Rifle?

I have seen many of them commonly painted black over what looks like blueing and wondered if this was original or some kind of service make work activity to keep them in good shape or if many of them got painted much later in civilian life.
Information
Warning: This is a relatively older thread
This discussion is older than 360 days. Some information contained in it may no longer be current.